Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Quantos ficaram em quarto lugar em 25 de abril?
 ###Tabelas: CREATE TABLE gasoline_tax_rates_across_canada (gasoline_tax_rates_across_canada_id AUTO_INCREMENT PRIMARY KEY, Government VARCHAR, Federal excise tax ( CAD¢ / L ) INT, Total excise tax (CAD¢/L) INT, Minimum tax incl. sales taxes (CAD¢/L) INT, Min. tax (CAD¢/US gal) INT) CREATE TABLE calendar (calendar_id AUTO_INCREMENT PRIMARY KEY, Round INT, Date VARCHAR, City and venue VARCHAR, Winner VARCHAR, Runner-up VARCHAR, 3rd placed VARCHAR, 4th placed VARCHAR, Results VARCHAR) CREATE TABLE 2009-10_table (2009-10_table_id AUTO_INCREMENT PRIMARY KEY, Club VARCHAR, Played VARCHAR, Drawn VARCHAR, Lost VARCHAR, Points for VARCHAR, Points against VARCHAR, Tries for VARCHAR, Tries against VARCHAR, Try bonus VARCHAR, Losing bonus VARCHAR, Points VARCHAR) CREATE TABLE juries (juries_id AUTO_INCREMENT PRIMARY KEY, Song VARCHAR, International Jury VARCHAR, Luleå VARCHAR, Umeå VARCHAR, Sundsvall VARCHAR, Falun VARCHAR, Karlstad VARCHAR, Örebro VARCHAR, Norrköping VARCHAR, Göteborg VARCHAR, Växjö VARCHAR, Malmö VARCHAR, Stockholm VARCHAR, Total INT) CREATE TABLE top_5_winners (top_5_winners_id AUTO_INCREMENT PRIMARY KEY, Year INT, Putri Pariwisata Indonesia VARCHAR, 1st Runner Up VARCHAR, 2nd Runner Up VARCHAR, 3rd Runner Up VARCHAR, 4th Runner Up VARCHAR)  
SELECT COUNT 4th placed FROM calendar WHERE Date = April 25